The religious persecution and intellectual intolerance of the sixteenth and seventeenth centuries compelled many heterodox groups and thinkers to resort to misdirection, hidden meaning, secrecy, and deceit. In this highly unusual interpretation, Perez Zagorin traces the theory and practice of religious leaders, philosophers, intellectuals, and men of letters who used deception to cloak dissident beliefs.

Zagorin surveys some of the chief sources of early modern doctrines of dissimulation in the Bible and the works of theologians from Jerome andAugustine to Erasmus, Luther, and Calvin. Subjects covered include Nicodemism, the name given by Calvin to secret Protestants who concealed their faith behind a facade of conformity to Catholic worship; crypto-Judaism in Spain; and the hidden beliefs of English Catholics. Other topics include the Catholic doctrine of mental reservation; the place of dissimulation in English Protestant casuistry; occultism; and dissimulation of religious unbelief among philosophers and men of letters. In charting the widespread phenomenon of lying and deceit and by exploring its evolutions, Perez Zagorin has made an important contribution to the historiography of an intellectually roiling and perilous time. He adds a vital dimension to our understanding of the religious, intellectual, and cultural history of the epoch before the modern. Lacey Baldwin Smith finds this hook “an impressive and scholarly work of cultural synthesis that coins a fresh label for the sixteenth and seventeenth centuries: the age of dissimulation. Zagorin’s efforts to compare and contrast Catholic and Protestant styles of dissimulation and Nicodemism are important, casting a new perspective and focus on the religious and intellectual dissent of the era.”

In this timely book, Cass R. Sunstein shows that organizations and nations are far more likely to prosper if they welcome dissent and promote openness. Attacking "political correctness" in all forms, Sunstein demonstrates that corporations, legislatures, even presidents are likely to blunder if they do not cultivate a culture of candor and disclosure. He shows that unjustified extremism, including violence and terrorism, often results from failure to tolerate dissenting views. The tragedy is that blunders and cruelties could be avoided if people spoke out.

Sunstein casts new light on freedom of speech, showing that a free society not only forbids censorship but also provides public spaces for dissenters to expose widely held myths and pervasive injustices. He provides evidence about the effects of conformity and dissent on the federal courts. The evidence shows not only that Republican appointees vote differently from Democratic appointees but also that both Republican and Democratic judges are likely to go to extremes if unchecked by opposing views. Understanding the need for dissent illuminates countless social debates, including those over affirmative action in higher education, because diversity is indispensable to learning.

Dissenters are often portrayed as selfish and disloyal, but Sunstein shows that those who reject pressures imposed by others perform valuable social functions, often at their own expense. This is true for dissenters in boardrooms, churches, unions, and academia. It is true for dissenters in the White House, Congress, and the Supreme Court. And it is true during times of war and peace.